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Factors influencing the concentration of minerals and metabolites in the plasma of cattle

Published online by Cambridge University Press:  27 March 2009

G. Wiener ,
W. S. Russell  and
A. C. Field
G. Wiener
Affiliation:
Animal Breeding Research Organisation, West Mains Road, Edinburgh EH9 3JQ
W. S. Russell
Affiliation:
Animal Breeding Research Organisation, West Mains Road, Edinburgh EH9 3JQ
A. C. Field
Affiliation:
Moredun Research Institute, Gilmerton Road, Edinburgh EH17 7JH
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Summary

One hundred and seventy-seven female Ayrshire cattle from approximately 6 months to 6 years of age were sampled on one occasion to determine the concentrations in plasma of Cu, P, Ca, Mg, Na, K and glucose. Eighty-nine adults, either lactating or dry, were re-sampled 2 months later to estimate concentrations of ketone bodies and free fatty acids. The data were analysed to estimate the contributions of various factors to variation in the concentrations.

The combination of age and stage of pregnancy or lactation significantly affected variation in all the constituents although some of this variation was accounted for by milk yield. The concentrations of Cu, Mg, glucose and ketones were significantly affected by milk yield. The presence of ketone bodies in milk (recorded in relation to the first occasion of bleeding only) was associated with a significant increase in the plasma concentrations of Na and Mg and a significant decrease of K and Ca.

The herd comprised pairs of genetically related animals. However, the estimates of heritability had large standard errors and only those for P and Ca were significantly positive.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 94 , Issue 2 , April 1980 , pp. 369 - 376
Copyright
Copyright © Cambridge University Press 1980

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